menu1on = new Image();
menu1on.src = "../../../images/" + nummer + "/encyclopaedia-aan.gif";
menu1off = new Image();
menu1off.src = "../../../images/" + nummer + "/encyclopaedia-uit.gif";

menu2on = new Image();
menu2on.src = "../../../images/" + nummer + "/form-aan.gif";
menu2off = new Image();
menu2off.src = "../../../images/" + nummer + "/form-uit.gif";

menu3on = new Image();
menu3on.src = "../../../images/" + nummer + "/disclaimer-aan.gif";
menu3off = new Image();
menu3off.src = "../../../images/" + nummer + "/disclaimer-uit.gif";

menu4on = new Image();
menu4on.src = "../../../images/" + nummer + "/colophon-aan.gif";
menu4off = new Image();
menu4off.src = "../../../images/" + nummer + "/colophon-uit.gif";

menu5on = new Image();
menu5on.src = "../../../images/" + nummer + "/tipoftheday-aan.gif";
menu5off = new Image();
menu5off.src = "../../../images/" + nummer + "/tipoftheday-uit.gif";

menu6on = new Image();
menu6on.src = "../../../images/" + nummer + "/links-aan.gif";
menu6off = new Image();
menu6off.src = "../../../images/" + nummer + "/links-uit.gif";

menu7on = new Image();
menu7on.src = "../../../images/" + nummer + "/messageboard-aan.gif";
menu7off = new Image();
menu7off.src = "../../../images/" + nummer + "/messageboard-uit.gif";

function aan(imgNr)
{
		imgName = "menu" + imgNr;
		imgOn = eval(imgName + "on.src");
		document[imgName].src = imgOn;
}

function uit(imgNr)
{
		imgName = "menu" + imgNr;
		imgOff = eval(imgName + "off.src");
		document[imgName].src = imgOff;
}